RW613 Superliner rear crossmember

[Vladislav]

15 hours ago, BottleHauler84 said:

@FarnorthMN I was looking at my 1988 MH613 with Neway air ride. It has this style rear cross member on it which is also a very popular crossmember Mack used for rear,  mid and at the cab. The part number is 9QL4551M. Mine has 2 of those back to back. They are 1/2" thick steel. 

You can find these used pretty easy. PG Adams also make these exact crossmembers and the quote i got from them was $257.05 a piece. 

 

Here's a couple internet pics of the 9QL4551M crossmember 

Worth to point out these do exist of different width. I have two R-models (which are originally differerent to a RW/MH) with those and the truck with double frame has them shorter than the single rail unit.

BTW my R-model with Neway has particulary this style for the rearmost crossmember. With shock brackets attached to it. 

[FarnorthMN]

fantastic thanks @Vladislav I'll keep at it it ill find it. Just takes time. 🤣🤣

[FarnorthMN]

19 hours ago, BottleHauler84 said:

Between Goodys Truck parts in toledo  and browsing LQK, Heavy Truck Parts and Ebay i usually find alot of stuff im looking for.

Being you're up in Minnesota, Vanderhags is one place to look. I know awhile back they had an early 90s MH cabover they parted out. Not sure if there's anything left but they have several yards.  Also, C&H Truck Parts in Nebraska i know for a fact has some MH Ultraliner and possibly a RW Superliner out there. 

https://candhtruck.com/

The Superliner2 and Ultraliner of the mid-late 80s share the same frames, so a MH Ultraliner crossmember will work on your RW Superliner.

Checked with vander haags today they didn't have any RW or MH in the lot.  Also call C&H they are in the process of looking.  I will lightly brush the whole  rear cross see if I can find a part number tomorrow! 

[kscarbel2]

On 11/18/2025 at 6:55 PM, FarnorthMN said:

Looking for rear suspension crossmember for my 1986 superliner.  its for the rear shocks on NeWay air suspension.

let me know what you have. thanks! 

Single channel frame?

9QL4551M x 2

44RU11192 spacer plate x 2

[FarnorthMN]

2 hours ago, kscarbel2 said:

Single channel frame?

9QL4551M x 2

44RU11192 spacer plate x 2

yes sir single frame! this is great thanks that will help thing along for sure!   

[FarnorthMN]

8 hours ago, Vladislav said:

Worth to point out these do exist of different width. I have two R-models (which are originally differerent to a RW/MH) with those and the truck with double frame has them shorter than the single rail unit.

BTW my R-model with Neway has particulary this style for the rearmost crossmember. With shock brackets attached to it. 

so are the 9QL4551M  replament for the style I have? that will work for the new way suspension mounts? Just need to drill? sorry for my stupidness 

[BottleHauler84]

5 hours ago, FarnorthMN said:

so are the 9QL4551M  replament for the style I have? that will work for the new way suspension mounts? Just need to drill? 

My 88 MH with Neway has the 9QL4551M crossmembers for the rearmost crossmember with the shock mount brackets bolted on it. You may have to punch new holes use them. Im not sure if the bolt pattern is the same as your current crossmember. 

Here's a document showing the different style crossmember Mack used. 

Edited 4 minutes ago by BottleHauler84

[BottleHauler84]

FYI, I checked all my torque rods on my truck with Neway.....im not sure what your axle spacing is on yours, so could be different but id say side to side rods are the same no matter.

I had 17QF460P245 for the front to back rods, and 17QF464p183 for side to side rods.

Atro came up with these rods as replacements. I thought they were pretty reasonable. 

TR62-41245  24.50" inches long

TR62-41183 18.25" inches long